Ontology Engineering for the Semantic Web COMP62342 Sean Bechhofer - - PowerPoint PPT Presentation

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Ontology Engineering for the Semantic Web

COMP62342 Sean Bechhofer and Uli Sattler University of Manchester sean.bechhofer@manchester.ac.uk

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Aims

The unit will provide students with a theoretical and practical understanding of leading edge solutions for the Semantic Web. It will introduce students to the W3C standard Web Ontology Language, OWL, and its underlying Description Logics. It will provide students with experience using a set of established patterns for developing OWL ontologies and help them to learn to avoid the major pitfalls in using OWL. It will give them an opportunity to become familiar with a widely used environment for developing and an API for applying OWL ontologies, and making use of reasoning services accessible via both.

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Organisational

• COMP62342 is taught by:
• 1. Sean Bechhofer
• 2. Uli Sattler
• Prerequisites: some familiarity with logic, programming, Java
• Teaching period: Fridays of the next 5 weeks

– with demonstrators present to ask during labs

• We will use Blackboard for additional material and the coursework
• Homepage: http://studentnet.cs.manchester.ac.uk/pgt/COMP62342/
• Please do not hesitate to ask if you have a question!

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Organisational

• Lab Demonstrators:

– Haoruo Zhao

• Communication:

– Blackboard discussion forums – Twitter #uom #comp62342

• You will also need to acquaint yourselves with the tools we will use during

the exercises, in particular Protégé 4.

• Protégé is installed on the machines in the lab under Linux

– instructions on how to install it at home/on your laptop is in Blackboard

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Organisational

• Assessment: 50% exam

50% coursework

• Coursework and Exercises:

– 1.5 days per week plus – reading – each week 3 pieces of coursework:

• Quiz
• Essay(s)
• Modelling or Programming

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Who are we?

• Sean Bechhofer:

– Participant in W3C WebOnt WG that defined the original OWL language – Developer of OilEd, the WonderWeb OWL API and other DL/OWL tools – Editor of W3C’s SKOS Recommendation

• Uli Sattler:

– Co-developer of the logics underlying OWL, OWL 2 and of their reasoning algorithms – Participant in W3C WebOnt WG that defined OWL 2

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Coursework and Exercises

• Ontology Development is a practical discipline, and the assessment of the

unit includes significant practical work.

• All work is distributed and collected through Blackboard

– always retain a copy of your work elsewhere! – backup!

• Marks & feedback are distributed through Blackboard
• We encourage you to use Blackboard’s discussion boards

– we will even help with questions – don’t forget to subscribe!

• Lateness

– work is generally due one week after assignment i.e., Fridays at 9am – work that is late: marked 0, no late submission

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Coursework and Exercises

• Each week, we give you several pieces of coursework:
• a number of small, short questions, often multiple choice

– to ensure you grasp the basic concepts

• Along with other tasks that may be :
• a small modelling task

– to appreciate the numerous ways in which things can be done – to get your hands dirty

• a short essay of ~200 - 300 words

– about an average blog post – to make you think & practice writing (project!)

• an assignment

– a programming task ➡ 40 marks per week

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Coursework: The Furniture Ontology

• In addition to the weekly tasks, there is a modelling task that spans the entire
• course. We will go through steps of ontology building process including the

identification of Competency Questions, performing Knowledge Acquisition, developing the Formalisation and Evaluating the results.

• The domain for this ontology will be Furniture.
• Ontology building is usually a collaborative process, and this task will be

done in small groups (of 3-4 students). – You will be allocated to groups (see BB), although formal group work does not begin until Week 2.

• Following the development of the ontology, you will be asked to provide an

evaluation of the ontology from another group. – You will be assessed on how well you have performed this evaluation process, but the results of your evaluations will not contribute towards assessment of the other ontology.

• You will also be required to provide individual reports discussing your
• ntology and the process that you went through in developing it.

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Plagiarism & Academic Malpractice

• We assume that you have successfully completed the

Plagiarism and Malpractice Test

• n Blackboard
• ...if you haven’t:

do so before you submit any coursework (assignment or assessment)

• ...because we work under the assumption that you know what you do
• ...and if you don’t, it costs you marks or more.
• Please be careful to distinguish between group tasks and individual tasks.

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Literature

• To obtain more detailed information, please refer to the reading list
• n the course homepage
• Follow the various available web resources linked from the course

homepage

• We assume that you

– are enthusiastic about your subject – go and find out about stuff you don’t know yet

Goals of the course: to be able to

• discuss/explain the role of ontology languages in applications,

in particular OWL and SKOS

• explain the syntax and semantics of OWL, and the decision procedures

that underpin the use of reasoning

• create an ontology for a particular domain to enhance an application
• understand how and which applications can be enhanced through the use
• f an ontology
• apply patterns in the design of ontologies
• design and build ontologies in OWL using the de facto standard editor,

Protege, justify and evaluate their design and explain their behaviour See http://studentnet.cs.manchester.ac.uk/pgt/COMP62342/syllabus

Roadmap

• Week 1 Motivation, intro to KR. Practical

introduction to OWL and Protégé

• Week 2 Knowledge Acquisition. Formalising
• Definitions. Formal Semantics.
• Week 3 Patterns. Modelling using roles.

Reasoning.

• Week 4 Programmatic manipulation of
• ntologies with the OWL API. More

reasoning.

• Week 5 Case studies. SKOS. Linked Data.
• Schedule

– Morning Lectures – Afternoon Practicals – TA Support on Tuesday afternoons

Bloom’s taxonomy of Learning